I can't offer you 120Hz, but the ThinkPad P51 with 4K screen has excellent colour gamut and accuracy and the best laptop keyboard in the business (with the possible exception of the old-style ThinkPad keyboard currently available only in the limited-edition "ThinkPad 25"). Battery life is pretty good.

Downsides: relatively bulky, pricey, no touchscreen or stylus input. (Upside of that: matt rather than glossy screen, which I think is difficult to combine with a touchscreen.)